Why did turbo tax tell me to mail taxes this year?

It depends. Your return may include some forms that cannot be e-filed. 

However, before you mail your return, try switching to e-file with the following the steps: 

1. In TurboTax Online, sign in to your account.
2. Select Tax Home in the left menu.
3. Scroll down to Your tax returns & documents.
4. Select 2020, and then select Add a State (you're not actually adding a state, this just gets you into the right area).
5. Select File in the left menu (expand your browser window if you don't see this, or select the menu icon in the top left corner).
6. On the Just one more step screen, follow steps 1 and 2 if you haven't already.
7. Select the Start button to the right of Step 3.
8. On the Let's get ready to e-file screen, select I want to e-file.
9. Follow the instructions to e-file your return.